Hello,

[sorry for the delay, I had some git SNAFUs]

> Could you also send and updated patch containing the VALUE optional
> argument to `org-re-property' and changing modifying only the (re ...)
> line in `org-find-property', with a new profiling?

Seems like this does trick. I don't really understand why, though. The
previous profiling seemed to indicate that most of the time was spent in
`org-entry-get' (that's why I removed it). Anyway, many thanks for
helping me out. Much appreciated.

I attached the new patch.

(let ((time (current-time)))
   (org-id-find "zangwill.nick_2014:aesthetic.judgment")
   (format "%ss" (time-to-seconds (time-subtract (current-time) time))))

--> "0.032598146s"

Here is the profiler report:

- command-execute                                                 215  89%
 - call-interactively                                             215  89%
  - funcall-interactively                                         140  58%
   + execute-extended-command                                      92  38%
   - eval-last-sexp                                                35  14%
    - elisp--eval-last-sexp                                        35  14%
     - eval                                                        35  14%
      - let                                                        35  14%
       - org-id-find                                               35  14%
        - org-id-find-id-in-file                                   35  14%
         - org-find-entry-with-id                                  35  14%
          - org-find-property                                      35  14%
           - save-excursion                                        35  14%
            - let                                                  35  14%
             - catch                                               35  14%
                while                                              35  14%
   + next-line                                                     13   5%
  + byte-code                                                      75  31%
+ redisplay_internal (C function)                                  15   6%
+ timer-event-handler                                              11   4%
+ ...                                                               0   0%

-- 
Florian Beck

>From 389d8cec4406c394f3bf955726823951b014f6aa Mon Sep 17 00:00:00 2001
From: Florian Beck <f...@miszellen.de>
Date: Mon, 30 Mar 2015 22:27:36 +0200
Subject: [PATCH] org.el: Allow searching for specific property value

* lisp/org.el (org-re-property): New optional argument.
(org-find-property): Use it.
---
 lisp/org.el | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/lisp/org.el b/lisp/org.el
index cf37950..4f61123 100755
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -6254,7 +6254,7 @@ takes into consideration inlinetasks."
 
 (defvar org-font-lock-keywords nil)
 
-(defsubst org-re-property (property &optional literal allow-null)
+(defsubst org-re-property (property &optional literal allow-null value)
   "Return a regexp matching a PROPERTY line.
 
 When optional argument LITERAL is non-nil, do not quote PROPERTY.
@@ -6262,14 +6262,22 @@ This is useful when PROPERTY is a regexp.  When ALLOW-NULL is
 non-nil, match properties even without a value.
 
 Match group 3 is set to the value when it exists.  If there is no
-value and ALLOW-NULL is non-nil, it is set to the empty string."
+value and ALLOW-NULL is non-nil, it is set to the empty string.
+
+With optional argument VALUE, match only property lines with
+that value; in this case, ALLOW-NULL is ignored.  VALUE is quoted
+unless LITERAL is non-nil."
   (concat
    "^\\(?4:[ \t]*\\)"
    (format "\\(?1::\\(?2:%s\\):\\)"
 	   (if literal property (regexp-quote property)))
-   (if allow-null
-       "\\(?:\\(?3:$\\)\\|[ \t]+\\(?3:.*?\\)\\)\\(?5:[ \t]*\\)$"
-     "[ \t]+\\(?3:[^ \r\t\n]+.*?\\)\\(?5:[ \t]*\\)$")))
+   (cond (value
+	  (format "[ \t]+\\(?3:%s\\)\\(?5:[ \t]*\\)$"
+		  (if literal value (regexp-quote value))))
+	 (allow-null
+	  "\\(?:\\(?3:$\\)\\|[ \t]+\\(?3:.*?\\)\\)\\(?5:[ \t]*\\)$")
+	 (t
+	  "[ \t]+\\(?3:[^ \r\t\n]+.*?\\)\\(?5:[ \t]*\\)$"))))
 
 (defconst org-property-re
   (org-re-property "\\S-+" 'literal t)
@@ -16323,7 +16331,7 @@ part of the buffer."
   (save-excursion
     (goto-char (point-min))
     (let ((case-fold-search t)
-	  (re (org-re-property property nil (not value))))
+	  (re (org-re-property property nil (not value) value)))
       (catch 'exit
 	(while (re-search-forward re nil t)
 	  (when (if value (equal value (org-entry-get (point) property nil t))
-- 
2.1.0

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